Mattress



FIG. 1 is a left upper perspective view of the mattress design;

FIG. 2 is a top planar view of the design shown in FIG. 1;

FIG. 3 is a bottom planar view of the design shown in FIG. 1;

FIG. 4 is a left planar side planar view of the design shown in FIG. 1;

FIG. 5 is a right side planar view of the design shown in FIG. 1;

FIG. 6 is a front planar view of the design shown in FIG. 1; and,

FIG. 7 is a rear planar view of the design shown in FIG. 1. 

CLAIM The ornamental design for a mattress, as shown and described. 